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(No Model.)

M R. H. ST. JOHN. SHUTTLE ACTUATING MECHANISM FOR SEWING MACHINES. No 485,897-

Patented Nov. 8, 1892.

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NITED STATES PATENT OFFICE.

ROSWELL H. ST. JOHN, OF CLEVELAND, OHIO, ASSIGNOR TO THE STANDARD SEWING MACHINE COMPANY, OF SAME PLACE.

SHUTTLE-ACTUATING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION fOrming part of Letters Patent No. 485,897, dated November 8, 1892. Application filed December 19, 1390. Serial No. 375,173. (No model.)

To all whom it may concern.-

Be it known that I, ROSWELL H. ST. JOHN, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Shuttle-Actuating Mechanism for Sewing-Machines; and I do hereby declare that the following is a full, clear, and exact description of the invention, to which will enable others skilled in the art to which it appertains to make and use the same. My invention consists in improvements in sewing-machines, and the special feature of novelty resides in the shuttle-operating mechr 5 anism and the parts associated therewith, all

substantially as shown and described, and particularly pointed out in the claim.

In the accompanying drawings, Figure 1 is a longitudinal sectional view of that part of a sewing-machine with which my improved mechanism is especially connected and showing the arm sectioned at the rear and the longitudinal section of a table taken substantially on line as as, Fig. 2, and disclosing the 2 5 operating mechanism beneath said table. Fig.

2 is a bottom view of a table With the operating mechanism in position thereon. Fig. 3 is a front elevation of the yoke and the brackets supporting the same with the operatingshaft having its extremity in the center of the yoke and showing the shuttle-arm at the top of the figure. Fig. 4 is a detail of the shuttle-supporting arm and the shuttle-carrier and showing that the shuttle-carrier is 5 adjustable upon this arm. A represents the table of the sewing-machine, which may be of any well-known style, and B is the arm.

C is the shuttle-operating shaft, connected 0 at its {rear end by link D with the powershaft above, whereby the said shaft C is rotated. Any suitable connection between the power-shaft and the said shaft C which will give the latter shaft a continuous rotary move- 5 ment while the machine is in operation may be adopted. This shaft C is supported in the bearings cl, preferably formed integral with the table or bed-plate A, although, if preferred, these bearings may be separate brackets attached to said plate or table. Suitable collars are fixed on the said shaft C to prevent axial movement therein; but any other means of preventing such movement maybe adopted. At the forward extremity c the said shaft is bent, as here shown, at an angle of about thirty-five degrees to the body thereof; but this angle of bend may be varied more or less, according as more or less throw of the shuttle may be desired. The bend in the proportion here shown is adapted to machines of ordico nary size and construction. This extremity or arm 0' operates in a yoke E, which is set at its lower end in a bracket F and at its upper end in the table or plate A, having suitable bearings with center screws fixed therein and adapted to be oscillated from side to side by the said arm 13. This yoke is substantially semicircular with its bearings at its ends and set at right' angles to the shaft C. The yoke between its ends has sides 6, integral at their ends, and with an open space between them adapted to receive and form a bearing for the short arm a on shaft C. The wear upon these sides, if any 0ccurs,is taken up by the screws 6, passing through said sides; but the wear will be very slow and im-, perceptible, at least for some time. Obviously when the shaft C is rotated the yoke E is given an oscillating movement from side to side in proportion to the angle of the bend 0. 8c The radius of this movement, so far as the extremity of the arm is concerned, is shown by a dotted circular line 9 Fig. 3. Thus in Fig. 3, which is a front elevation of the parts when in the position shown in Fig. 2, the arm 0 is shown at the extremity of its movement to the right, and a corresponding position on the dotted line (2 upon the opposite side of the circle is the limit of its movement in that direction. The principle upon which the arm 0 0 operates may be said to be that of a cam, and the said arm at all times describing a large circle with the shaft C as the center has such leverage as will easily and efiectually carry the yoke E from side to side, and in a noise- 9 5 less easy manner, without any strain whatever at any point in the movement. Obviously the leverage of the arm 0 is at all times so exerted as to make the movement of the yoke easy and positive.

Now in order that the shuttle may be carried from side toside by this yoke I provide the yoke at its top with an arm g, which is made rigid with the yoke and upon which is adjustably'secured by screws 9' the shuttlecarrier H. This carrier works in a shuttlerace K, formed in the table or bed-plate A. The movement of the shuttle being circular, the form of the race K at its front edge li-ke- I wise is circular, and the carrier is arranged. to travel in this race from side to side, according to the movements of the yoke E,..upon. which and the arm 9 the carrier is secured.

The arm 0 is shown here as formed by bending the end of shaft 0; but it might be a sep 2 arate piece fixed on said shaft.

of inclination or construction of arm cor its equivalent, operating with the effect of the construction of arm 0 shown, is understood to be within the scope of the invention, this i means of operating a shuttle-carrier being regarded as broadly new.

Any angle Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

r In a sewing-machine, a shuttle-operating shaft having its front end bent at an angle to its body, in combination with a semicircular- 

